CN110637234B - Radiated interference wave measuring method, radiated interference wave measuring system, and recording medium - Google Patents
Radiated interference wave measuring method, radiated interference wave measuring system, and recording medium Download PDFInfo
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/001—Measuring interference from external sources to, or emission from, the device under test, e.g. EMC, EMI, EMP or ESD testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/001—Measuring interference from external sources to, or emission from, the device under test, e.g. EMC, EMI, EMP or ESD testing
- G01R31/002—Measuring interference from external sources to, or emission from, the device under test, e.g. EMC, EMI, EMP or ESD testing where the device under test is an electronic circuit
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R23/16—Spectrum analysis; Fourier analysis
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Abstract
The radiated interference wave measuring method comprises the following steps: a temporary measurement step (S21) for performing a wide-band measurement, which is a measurement including peak detection and quasi-peak detection, for a measurement frequency range by a first fast Fourier transform of the EMI receiver (16); a calculation step (S22) for calculating the difference between the obtained peak level and the quasi-peak level for the measurement frequency that is a candidate for the measurement result of the measurement frequency range; a determination step (S23) for determining whether the obtained difference is less than a predetermined reference value corresponding to the measurement frequency; and an output step of outputting a result obtained by the wide band measurement as an interference level of the radiated interference wave (S24) when the difference is determined to be smaller than the reference value, performing narrow band measurement which is measurement performed in a frequency range narrower than the measurement frequency range and is measurement by fast Fourier transform of the EMI receiver (16) when the difference is determined to be equal to or larger than the reference value, and outputting the result as the interference level of the radiated interference wave (S25).
Description
Technical Field
The present invention relates to a radiated interference wave measuring method and a radiated interference wave measuring system, and more particularly to a radiated interference wave measuring method and the like suitable for determining compliance with a CISPR standard which requires an impulse response characteristic.
Background
Electromagnetic waves emitted from electronic devices cause electromagnetic Interference (EMI) that interferes with the functions of other electronic devices. Accordingly, an EMI-associated industrial standard (hereinafter, also referred to as "standard") is established by public institutions such as The International Special Committee for Radio Interference on Radio Interference (CISPR), The American National Standards Institute (ANSI), and The like, and The grades thereof are limited by government bodies in The United states, China, Japan, and The like. For example, the CISPR32 standard defines allowable values of the levels of the detection schemes such as the peak value, quasi-peak value, and average value of EMI, and determines whether or not the levels satisfy the allowable values.
Conventionally, various techniques have been proposed for efficiently measuring radiated interference waves (see, for example, patent document 1). Patent document 1 discloses that an EMI receiver of Fast Fourier Transform (FFT) system is used to measure a radiated interference wave from a measurement target. In the fast fourier transform EMI receiver, scanning of a measurement frequency range is not required as compared with a normal superheterodyne EMI receiver (a so-called scanning method in which a low frequency band and a high frequency band of a frequency are repeatedly scanned), and therefore, there are advantages that high-quality measurement without missing impulse noise can be performed, and there are advantages that data by each detection method (that is, measurement can be performed in a very short time) such as a Peak (Peak, hereinafter also referred to as "PK"), a Quasi-Peak (hereinafter also referred to as "QP"), an Average (Average, hereinafter also referred to as "AV") can be simultaneously obtained.
(Prior art document)
(patent document)
Patent document 1: international publication No. 2008/023640
Disclosure of Invention
Problems to be solved by the invention
However, the problem with the radiated interference wave measurement by the EMI receiver using the fast fourier transform method disclosed in patent document 1 is that the measurement needs to be performed in a wide fast fourier transform frequency bandwidth, and therefore, the determination of the coincidence of the impulse response characteristics that satisfy the requirements of the CISPR 16-1-1 standard cannot be performed. Here, the fast fourier transform bandwidth is a bandwidth in which the first fast fourier transform of the EMI receiver by the fast fourier transform method can be performed. In general, the bandwidth of the wide-band fast fourier transform is a bandwidth of 1MHz or more, for example, 50MHz, 100MHz, 500MHz, or the like. According to the measurement of the bandwidth based on the fast fourier transform of 500MHz, the measurement frequency range of 30MHz to 1000MHz required by the standard can be ended by the measurement of two ranges (measurement of dividing the measurement frequency range into two bands).
The response to quasi-peak detection is specified to 1Hz as the lowest pulse repetition frequency according to the impulse response characteristics required by the CISPR 16-1-1 standard. The response of quasi-peak detection is specified to be 40dB smaller than the response of peak detection for 1 Hz. The requirement for such an impulse response characteristic shows that a sufficiently wide dynamic range is required. In order to secure a wide dynamic range, it is necessary to use a band limiting filter as a pre-selector for performing processing for removing a signal outside a measurement band without attenuating a signal inside the measurement band with respect to an input signal at an input stage of an EMI receiver. However, in order to measure the wide-band fast fourier transform bandwidth, it is necessary to maintain the wide-band fast fourier transform bandwidth, and therefore, such a pre-selector cannot be used. This standard describes that an EMI receiver that does not use a pre-selector can be used only for measurement of pulses having a pulse repetition frequency of 20Hz or more.
Therefore, in order to determine the compliance of the impulse response characteristics required to satisfy the CISPR 16-1-1 standard using the fast fourier transform EMI receiver disclosed in patent document 1, it is necessary to perform a troublesome operation of performing measurement of the wide-band fast fourier transform bandwidth by the fast fourier transform EMI receiver, and then checking whether or not the repetition frequency is 20Hz or more for each of the noise exceeding the allowable value and the representative noise close to the allowable value. Further, noise radiated from the eut (equipment Under test) is often complicatedly held, and it is often difficult to evaluate the repetition frequency. Therefore, conventionally, measurement based on scanning of a narrow band filter such as an EMI receiver using a wideband superheterodyne method is performed without performing measurement based on a fast fourier transform frequency bandwidth having the above-described advantages.
Accordingly, an object of the present invention is to provide a radiated interference wave measurement method and a radiated interference wave measurement system that can automatically determine whether an impulse response characteristic satisfying a standard requirement is satisfied without performing a complicated and difficult operation even if a broadband measurement using an EMI receiver of the fast fourier transform system is performed.
Means for solving the problems
In order to achieve the above object, a radiated interference wave measuring method according to an aspect of the present invention is a radiated interference wave measuring method for measuring a radiated interference wave from a measurement target object in a measurement frequency range, the method including: a temporary measurement step of performing a broadband measurement including peak detection and quasi-peak detection with respect to the radiated interference wave by a first fast fourier transform of an EMI receiver with respect to the measurement frequency range; a calculation step of calculating a difference between the peak level and the quasi-peak level obtained in the provisional measurement step for a measurement frequency that becomes a candidate of the measurement result of the measurement frequency range; a determination step of determining whether or not the difference obtained in the calculation step is smaller than a predetermined reference value corresponding to the measurement frequency; and an output step of outputting a result obtained by the wide band measurement as an interference level of the radiated interference wave when it is determined by the determination step that the difference is smaller than the reference value, performing narrow band measurement which is measurement performed in a frequency range narrower than the measurement frequency range and is measurement by fast fourier transform of the EMI receiver for the measurement frequency, and outputting a result obtained by the narrow band measurement as an interference level of the radiated interference wave when it is determined by the determination step that the difference is equal to or larger than the reference value.
In order to achieve the above object, a radiated interference wave measurement system according to an aspect of the present invention measures a radiated interference wave from a measurement target object in a measurement frequency range, the radiated interference wave measurement system including: an EMI (Electro-Magnetic Interference) receiver for performing a broadband measurement on the radiated Interference wave by a first fast Fourier transform in the measurement frequency range, the broadband measurement being a measurement including peak detection and quasi-peak detection; and a control device connected to the EMI receiver via a communication path, the control device including: obtaining data obtained by the wideband measurement from the EMI receiver, calculating a difference between a peak level and a quasi-peak level obtained by the wideband measurement for a measurement frequency that is a candidate for a measurement result of the measurement frequency range based on the obtained data, determining whether the calculated difference is smaller than a predetermined reference value corresponding to the measurement frequency, outputting a result obtained by the wideband measurement as an interference level of the radiated interference wave when it is determined that the difference is smaller than the reference value, controlling the EMI receiver to perform a narrowband measurement when it is determined that the difference is equal to or greater than the reference value, outputting a result obtained by the narrowband measurement from the EMI receiver as an interference level of the radiated interference wave, the narrowband measurement being a measurement performed in a frequency range narrower than the measurement frequency range, and is a fast fourier transform based measurement targeted at the measurement frequency.
The present invention can be realized not only as a radiated interference wave measuring method and a radiated interference wave measuring system, but also as a program for causing a computer to execute the radiated interference wave measuring method, and a computer-readable recording medium such as a CD-ROM in which the program is recorded.
Effects of the invention
According to the present invention, it is possible to realize a radiated interference wave measurement method and a radiated interference wave measurement system that can determine whether an impulse response characteristic satisfying a standard requirement meets a standard requirement without performing a complicated and difficult operation.
Drawings
FIG. 1 is a graph showing the impulse response characteristics required by the CIPR 16-1-1 standard.
Fig. 2 is a diagram illustrating that an EMI receiver can secure a dynamic range using a pre-selector.
FIG. 3 is a diagram illustrating a measurement method in a case of using a general receiver defined in the CISPR 16-2-3 (edition4:2016) standard.
Fig. 4 is a diagram showing a configuration of a radiated interference wave measurement system according to an embodiment.
Fig. 5 is a flowchart showing the operation of the radiated interference wave measurement system according to the embodiment.
Fig. 6 is a flowchart showing a detailed sequence of the provisional step S21 of fig. 5.
Fig. 7 is a diagram showing an example of a spectrum obtained by measurement in the radiated interference wave measurement system according to the embodiment.
Detailed Description
[ knowledge that forms the basis of the present invention ]
First, the present inventors have found that a radiated interference wave measurement method and a radiated interference wave measurement system capable of determining whether or not an impulse response characteristic satisfying a standard requirement meets the standard requirement without performing complicated and difficult work will be described.
(1) Advantages of broadband-based measurement of fast fourier transform bandwidth
By measuring the radiated interference wave by the EMI receiver using the fast fourier transform method, high-quality measurement without looking at impulse noise (that is, continuous measurement without a gap) can be performed as compared with the case of using the EMI receiver of the normal superheterodyne method (so-called scanning method). According to the EMI receiver of the superheterodyne method, only one frequency level is measured at each instant during scanning, and therefore, the entire spectrum of a broadband radiated interference wave cannot be obtained at the same time. For example, when a 200MHz radiated interference wave is measured during scanning by a superheterodyne EMI receiver and a radiated interference wave in another frequency band (for example, around 180 MHz) is generated instantaneously (that is, impulsive noise), the radiated interference wave cannot be measured and is overlooked. In contrast, in the radiated interference wave measurement by the EMI receiver using the fast fourier transform method, since signals of the fast fourier transform frequency bandwidth are measured simultaneously, high-quality measurement without overlooking impulse noise in the fast fourier transform frequency bandwidth (that is, continuous measurement without a gap) can be performed.
Further, the measurement of the radiated interference wave by the EMI receiver using the fast fourier transform method has an advantage that data of each detection method based on a peak value, a quasi-peak value, an average value, and the like can be obtained at the same time (that is, high-speed measurement is possible) as compared with the case of using the EMI receiver using the normal superheterodyne method. For example, in quasi-peak detection, generally, the acquisition of the level of one frequency requires at least one second of measurement time. In the superheterodyne EMI receiver, a very long measurement time is required to scan a measurement frequency range by the quasi-peak detection. On the other hand, according to the EMI receiver of the fast fourier transform system, since the measurement by the quasi-peak detection is performed by performing the operation once on the signal in the measurement frequency range, the measurement by the quasi-peak detection can be completed in a very short time.
Therefore, for example, according to the EMI receiver of the fast fourier transform system having a wide fast fourier transform band width of a wide band such as 500MHz, high-quality measurement without missing impulse noise can be performed in a short time by only two-range measurement (measurement in which the measurement frequency range is divided into two bands) for the measurement frequency range of 30MHz to 1000MHz required by the standard. Alternatively, if the fast fourier transform bandwidth is 1000MHz, one measurement may be performed.
(2) Disadvantages of broadband-based measurement of fast fourier transform bandwidth
However, such measurement of the bandwidth of the wideband fast fourier transform has a problem that the EMI receiver cannot satisfy the impulse response characteristics required by the CISPR 16-1-1 standard and cannot be used as a coincidence judgment. That is, in the measurement of the bandwidth of the fast fourier transform band by the wide band, high-speed measurement with high reliability can be performed, but there is a problem that the impulse response characteristic which cannot satisfy the standard requirement is present.
FIG. 1 is a graph showing the impulse response characteristics required by the CIPR 16-1-1 standard. Here, the level difference of the response to Peak detection ("Peak"), Quasi-Peak detection ("Quasi-Peak"), effective value detection ("RMS-AV"), and Average value detection ("Average") is shown. The horizontal axis shows the pulse repetition frequency, and the vertical axis shows the level difference (attenuation Factor dB)) of the response with respect to Peak detection ("Peak").
As can be seen from fig. 1, in the CIPR 16-1-1 standard, the pulse response characteristic up to a pulse repetition frequency of 1Hz is defined for quasi-peak detection, and the response at 1Hz is 40dB different from that of peak detection. Such a requirement for the impulse response characteristic shows that even if the response of quasi-peak detection is small, the input attenuation cannot be reduced (that is, the attenuation is suppressed) with respect to the input signal to the EMI receiver, and that a sufficiently wide dynamic range is required.
In order to ensure a sufficiently wide dynamic range, a pre-selector is used at the input stage of the EMI receiver, which performs a process of removing signals outside the measurement band with respect to the input signal without attenuating signals within the measurement band.
Fig. 2 is a diagram illustrating that an EMI receiver can secure a dynamic range using a pre-selector. Here, the functional blocks of the EMI receiver 20 including the pre-selector and the frequency spectrums of the processed signals before and after the respective functional blocks when the pulse is input as the input signal are shown.
As shown in fig. 2, the EMI receiver 20 is composed of an attenuator 21, a pre-selector 22, a mixer 23, an intermediate frequency filter 24, a detector 25, a detector 26, and a display 27.
Here, it is assumed that a pulse having a wide-band spectrum shown in fig. 2 (a) is input. After the input pulse is attenuated by the attenuator 21, the signal outside the measurement band is removed by the pre-selector 22, and only the signal within the measurement band passes through without being attenuated, thereby becoming a signal having a spectrum shown in fig. 2 (b).
The signal having passed through the pre-selector 22 is multiplied by the local signal by the mixer 23, and is converted into a signal of an intermediate frequency shown in fig. 2 (c) by the intermediate frequency filter 24.
Then, the signal is input to the detector 26 after passing through the detectors 25 of the respective detection methods based on the peak value, the quasi-peak value, the average value, and the like, and the response level is obtained by the detector 26 and displayed on the display 27 as the measurement value based on the respective detection methods shown in fig. 2 (d).
In this way, by using the pre-selector 22 to remove signals outside the measurement band in order to measure pulses of a low repetition frequency, only signals within the measurement band pass through without being attenuated, thereby preventing saturation of the input stage (i.e., the mixer 23) of the EMI receiver and ensuring a dynamic range necessary for measurement of an impulse response characteristic that satisfies the CIPR 16-1-1 standard.
However, in order to measure the wide-band fast fourier transform bandwidth, it is necessary to maintain the wide-band fast fourier transform bandwidth, and therefore, such a narrow-band pre-selector cannot be used. In other words, a pre-selector using a wide measurement band corresponding to a wide fast fourier transform band width of a band is required, and thus, the input stage of the EMI receiver reaches a saturation level.
That is, in order to widen the fast fourier transform frequency band, the effect of the pre-selector has to be reduced, the dynamic range required to measure pulses with a low repetition frequency is insufficient, and as a result, the measurement of the impulse response characteristics satisfying the CIPR 16-1-1 standard cannot be performed.
(3) Solving means
Accordingly, the present inventors have earnestly studied and, as a result, focused on the following points, conceived an automatic measurement method capable of measuring an impulse response characteristic that satisfies the CIPR 16-1-1 standard while using a measurement of a broadband-based fast Fourier transform frequency bandwidth.
The following (i) and (ii) are noted.
(i) In the measurement of a wide-band fast fourier transform frequency bandwidth, there is a possibility that impulse response characteristics required by standards are not satisfied with respect to an impulse having a low repetition frequency, but in reality, there are not many objects to be measured in which such impulse noise having a low repetition frequency occurs.
(ii) On the other hand, the CISPR 16-2-3 (edition4:2016) standard, which defines the response characteristics of an impulse, defines a method for determining whether or not to perform an accurate impulse response, in order to measure by a general receiver (i.e., a spectrum analyzer (hereinafter simply referred to as "spectrum analyzer") which does not satisfy the above-mentioned definition in part).
FIG. 3 is a diagram illustrating a measurement method in a case of using a general receiver defined in the CISPR 16-2-3 (edition4:2016) standard. As shown in fig. 3, for pulses having a repetition frequency of 20Hz or more, it is specified that (a) a quasi-peak detector measurement using a spectrum analyzer without a pre-selector can be used, (b) a user needs to prove that the spectrum analyzer used meets an impulse response characteristic having a repetition frequency of 20Hz or more, and (c) the proving method confirms that the level difference between the peak detector and the quasi-peak detector is the value shown in the table of fig. 3 (7 dB at 9kHz to 150kHz (band a), 13dB at 150kHz to 30MHz (band b), 21dB at 30MHz to 300MHz (band c), 21dB at 300MHz to 1000MHz (band d), or less.
In reality, the measurement method shown in the CISPR 16-2-3 (edition4:2016) standard is not used because a measurer needs to have some knowledge about the measurement of the radiated interference wave, and because the measurement of the peak detection and the quasi-peak detection takes much time and labor, many users use an EMI compliant receiver (a standard-compliant EMI receiver).
The present inventors have reached the following concept based on the two concerns (i) and (ii).
That is, the measurement method using a general receiver defined in the CISPR 16-2-3 (edition4:2016) standard is applied to an automatic measurement method using software. That is, whether or not the measured noise is an accurate response is automatically determined for all the noises measured, and the measurement result obtained by measuring the bandwidth of the wide-band fast fourier transform is used as the final measurement result for the noise that is acceptable in the determination, and the automatic measurement using the narrow-band pre-selector of the EMI receiver of the fast fourier transform method in which the bandwidth is limited is performed for the noise that is not in accordance with the determination.
More specifically, the measurement of the bandwidth of the fast fourier transform based on the wide band by the EMI receiver using the fast fourier transform method is performed by using the deviation between the values of the peak detection and the quasi-peak detection, and the values of the peak detection and the quasi-peak detection are obtained at the same time, according to the fact that the repetition frequency of the pulse changes, whether or not the deviation is equal to or more than a certain value is automatically determined, and the setting of the measurement mode of the bandwidth of the fast fourier transform based on the narrow band, which can be used by the conventional receiver mode or the pre-selector, is automatically switched to the setting that satisfies the standard requirement, so that the result that the standard requirement is completely satisfied is obtained.
Accordingly, by using an automatic measurement method using measurement of a broadband fast fourier transform bandwidth, a highly reliable measurement result without missing noise can be obtained by a measurement method based on a standard completely in a substantially equal or shorter measurement time than before. That is, it is possible to determine whether the impulse response characteristics required by the CISPR 16-1-1 standard are satisfied without performing complicated and difficult work.
[ embodiment ]
Hereinafter, embodiments of the present invention based on the knowledge of the present inventors will be described in detail with reference to the accompanying drawings. The embodiments described below all show a specific example of the present invention. The numerical values, shapes, materials, constituent elements, arrangement positions and connection forms of the constituent elements, steps, and the order of the steps shown in the following embodiments are merely examples and do not limit the spirit of the present invention. Among the components of the following embodiments, components that are not described in the embodiments showing the uppermost concept of the present invention will be described as arbitrary components. The drawings are not strictly shown. In each drawing, substantially the same structure is denoted by the same reference numeral, and redundant description may be omitted or simplified.
Fig. 4 is a diagram showing a configuration of the radiated interference wave measuring system 10 according to the embodiment.
The radiated interference wave measurement system 10 is a measurement system for evaluating EMI in a measurement frequency range (for example, 100MHz to 300MHz), and includes a turntable 11, an antenna mast 13, an antenna 14, a signal cable 15, an EMI receiver 16, a control cable 17, a turntable/antenna mast controller 18, and a control device 19. In the figure, the object 12 placed on the turntable 11 is also shown.
The turntable 11 is a rotatable table on which a non-conductive table on which the measurement target 12 is placed, and rotates in response to a control signal from the turntable/antenna mast controller 18.
The antenna 14 is an antenna for detecting a radiated interference wave radiated from the object 12, and detects a radiated interference wave in at least a measurement frequency range.
The mast 13 is an antenna elevating table for elevating the antenna 14, and the antenna 14 is elevated by receiving a control signal from the turntable/mast controller 18.
The signal cable 15 is a cable for transmitting an electrical signal of a radiated interference wave detected by the antenna 14 to the EMI receiver 16. A preamplifier, an RF selector, and the like may be inserted in the middle of the signal cable 15.
The EMI receiver 16 is an EMI receiver of a fast fourier transform system. When the frequency bandwidth in which the first fast fourier transform by the EMI receiver 16 can be performed is set as the fast fourier transform frequency bandwidth, the EMI receiver 16 performs measurement by the fast fourier transform with respect to a frequency range (from a certain frequency (start frequency) to a frequency (end frequency) of the fast fourier transform frequency bandwidth) specified by manual or external control. For example, the fast fourier transform bandwidth is 50MHz, and 0 to 1000MHz can be specified as the start frequency.
The EMI receiver 16 also includes a filter and a detector for obtaining a peak value, a quasi-peak value, an average value, an effective value, and the like. That is, the EMI receiver 16 can perform a wide-band measurement, which is a measurement including peak detection and quasi-peak detection, for a measurement frequency range by a single fast fourier transform with respect to the radiated interference wave.
The EMI receiver 16 includes a wide-band and narrow-band pre-selectors as pre-selectors of the input stage. The wideband pre-selector is a wide band pass filter having a bandwidth (for example, 80MHz) through which a signal in a measurement frequency range passes, which is used for wideband measurement in which measurement is performed by a fast fourier transform whose fast fourier transform frequency bandwidth is one order of the measurement frequency range (here, 50 MHz). The narrowband pre-selector is a narrow band-pass filter having a bandwidth (e.g., 2MHz) that passes only a specific frequency signal, which is used when only narrowband measurement based on fast fourier transform of a specific frequency is concerned.
The EMI receiver 16 controls various settings such as a frequency range to be subjected to fast fourier transform, start and stop of fast fourier transform, output of measurement results, and the like, in accordance with a command (i.e., external control) received from the control device 19 via the control cable 17.
The control cable 17 is a cable for connecting the control device 1 to the EMI receiver 16 and the turntable/mast controller 18, and is, for example, a cable for gpib (general Purpose Interface bus). The control cable 17 transmits instructions from the control device 19 to the EMI receiver 16 and the turntable/mast controller 18, or transmits status information of the equipment and measurement results in the opposite direction.
The turntable/mast controller 18 is a drive controller for controlling the turntable 11 and the mast 13, and controls the rotation of the turntable 11 and the elevation of the antenna 14 of the mast 13 in accordance with a command from the control device 19 received via the control cable 17.
The control device 19 is a controller that controls the EMI receiver 16 and the turntable/antenna mast controller 18 by transmitting a command via the control cable 17, and is, for example, a PC (personal computer) including a memory such as a ROM and a RAM, an auxiliary storage device such as a hard disk that holds programs and data, a processor that executes programs, a communication and control interface for connecting to peripheral devices, an input device and a display for performing a conversation with a measurer, and the like.
Specifically, the control device 19 executes a built-in program by a built-in processor, and controls the rotation of the object 12 to be measured by the turntable 11 and the elevation of the antenna 14 of the antenna mast 13 in accordance with an instruction from the measurer (position control step), causes the EMI receiver 16 to perform the fast fourier transform measurement step, or obtains the measurement result of the EMI receiver 16, thereby performing the automatic measurement of the EMI. Here, the fast fourier transform measurement step is a step of, when a frequency bandwidth in which the first fast fourier transform by the EMI receiver 16 can be performed is set as the fast fourier transform frequency bandwidth, dividing the measurement frequency range by the fast fourier transform frequency bandwidth, sequentially moving the plurality of divided frequency ranges (each of the plurality of divided frequency ranges is set as the measurement frequency range), and performing measurement including peak detection and quasi-peak detection by the fast fourier transform of the EMI receiver 16 with respect to the radiated interference wave received by the antenna 14.
In this case, regarding the control of the turret 11, for example, in the fast fourier transform measurement step, the control device 19 performs measurement while continuously or stepwise rotating the object 12 to be measured with a first frequency range of the fast fourier transform frequency bandwidth as an object and then performs measurement while continuously or stepwise rotating the object 12 to be measured with a second frequency range of the fast fourier transform frequency bandwidth adjacent to one frequency range as an object and continuously or stepwise rotating the object 12 to be measured with the turret 11. In the measurement of the stepwise rotation, the process of performing the measurement while the turntable 11 is rotated by a predetermined angle (for example, 10 degrees) and temporarily stopped is repeated.
In the control of the antenna mast 13, the control device 19 executes, for example, a fast fourier transform measurement step after setting the antenna 14 of the antenna mast 13 to a first height in the position adjustment step, and then executes a fast fourier transform measurement step after moving the antenna 14 of the antenna mast 13 to a second height in the position adjustment step.
The fast fourier transform measurement step includes a case where the frequency bandwidth of the fast fourier transform is equal to or more than the bandwidth of the measurement frequency range, and the measurement of the measurement frequency range is completed by one fast fourier transform.
Further, the control device 19 controls the EMI receiver 16 so that a wideband measurement including a peak detection and a quasi-peak detection is performed on the measurement frequency range by one fast fourier transform by the EMI receiver 16 in the fast fourier transform measurement step (temporary measurement step), obtains data obtained by the wideband measurement from the EMI receiver 16, calculates a difference between the peak level and the quasi-peak level obtained by the wideband measurement for a measurement frequency that is a candidate of the measurement result of the measurement frequency range based on the obtained data (calculation step), determines whether or not the calculated difference is smaller than a predetermined reference value corresponding to the measurement frequency (determination step), outputs the result obtained by the wideband measurement as an interference level of the radiated interference wave when it is determined that the difference is smaller than the reference value, when it is determined that the difference is equal to or greater than the reference value, the EMI receiver 16 is controlled to perform narrow-band measurement, and the result obtained by the narrow-band measurement is obtained from the EMI receiver 16 and output as the interference level of the radiated interference wave, the narrow-band measurement being measurement performed in a frequency range narrower than the measurement frequency range and being measurement by fast fourier transform targeted for the measurement frequency (output step).
Next, the operation of the radiated interference wave measuring system 10 according to the present embodiment configured as described above (i.e., a radiated interference wave measuring method) will be described.
Fig. 5 is a flowchart showing the operation of the radiated interference wave measuring system 10 according to the embodiment.
First, the control device 19 controls the EMI receiver 16 so that the measurement of the bandwidth of the wideband fast fourier transform (i.e., the first fast fourier transform) is performed on the measurement frequency range (here, each of the first to fourth frequency ranges) by performing wideband measurement including peak detection and quasi-peak detection with respect to the measurement frequency range (here, each of the first to fourth frequency ranges) (temporary measurement step S21). Specifically, the control device 19 controls the EMI receiver 16 to perform a single fast fourier transform-based wide band measurement in which 50MHz is the fast fourier transform frequency bandwidth, for each of the measurement frequency ranges (here, the first to fourth frequency ranges). The temporary measurement step S21 will be described in detail later with reference to fig. 6.
Next, the control device 19 selects one or more measurement frequencies that are candidates for an arbitrary measurement result from the measurement frequency range (here, the first to fourth frequency ranges), and calculates the difference between the peak level obtained by the broadband measurement and the quasi-peak level for each of the selected measurement frequencies (calculation step S22). Here, the "measurement frequency that becomes a candidate of the measurement result in the measurement frequency range" is a frequency used as the final measurement result, and is, for example, a frequency of a plurality of (for example, five) peaks selected in descending order from the highest peak in the spectrum of quasi-peaks obtained by the broadband measurement.
Then, the control device 19 determines whether or not the difference obtained by the calculation is smaller than a reference value predetermined in accordance with the measurement frequency (determination step S23). Here, the reference value is a value shown in the table of fig. 3. That is, as reference values, 7dB is used at the measurement frequency of 9kHz to 150kHz (band A), 13dB is used at the measurement frequency of 150kHz to 30MHz (band B), 21dB is used at the measurement frequency of 30MHz to 300MHz (band C), and 21dB is used at the measurement frequency of 300MHz to 1000MHz (band D). In the present embodiment, the measurement frequency range is 100M to 300mhz (band c), and therefore, 21dB is used as the reference value.
As a result, if the control device 19 determines that the difference obtained in the calculation step S22 is smaller than the reference value at each measurement frequency (yes in determination step S23), it outputs the result obtained by the broadband measurement to the display as the interference level of the final radiated interference wave (S24). At this time, the control device 19 may output a result obtained by performing the broadband measurement under a condition different from the broadband measurement at the temporary measurement step S21 as the interference level of the final radiated interference wave. For example, the control device 19 may cause the EMI receiver 16 to perform simple broadband measurement only for determining whether or not the impulse response characteristic is satisfied in the temporary measurement step S21, cause the EMI receiver 16 to perform precise broadband measurement for determining compliance with the standard requirement after determining that the impulse response characteristic is satisfied (yes in determination step S23), and output the result of the precise broadband measurement as the final interference level of the radiated interference wave to the display.
On the other hand, if it is determined that the difference obtained in the calculation step S22 is equal to or greater than the reference value at each measurement frequency (yes in determination step S23), the control device 19 controls the EMI receiver 16 so that narrow-band measurement, which is measurement based on fast fourier transform for the measurement frequency, is performed in a frequency range narrower than the measurement frequency range, obtains the result obtained by the narrow-band measurement from the EMI receiver 16, and outputs the result to the display as the interference level of the final radiated interference wave (S25). Specifically, the control device 19 controls the EMI receiver 16 so as to perform narrow-band measurement by peak detection and quasi-peak detection using a narrow-band pre-selector, with respect to each of the measurement frequencies (for example, the frequencies of the peaks determined as the peaks having a difference equal to or greater than the reference value obtained in the calculation step S22, out of the frequencies of the five peaks selected in descending order from the highest peak in the spectrum of the quasi-peaks obtained by the wide-band measurement), and outputs the result obtained by the narrow-band measurement to the display as the interference level of the radiated interference wave.
Fig. 6 is a flowchart showing a detailed sequence of the temporary measurement step S21 of fig. 5. Fig. 7 is a diagram showing an example of a spectrum obtained by measurement by the radiated interference wave measurement system 10 according to the embodiment (i.e., a spectrum displayed on a display of the control device 19). Here, an example of an operation in which the fast fourier transform frequency bandwidth of the EMI receiver 16 is 50MHz, the measurement frequency range of 100MHz to 300MHz is divided into four ranges, and the four divided frequency ranges are sequentially shifted to measure the radiated interference wave is shown.
Further, when 100MHz to 300MHz is input as the measurement frequency range for EMI measurement, the control device 19 divides the measurement frequency range by the fast fourier transform bandwidth (50MHz) as an initial process to calculate four frequency ranges (a first frequency range (100MHz to 150MHz), a second frequency range (150MHz to 200MHz), a third frequency range (200MHz to 250MHz), and a fourth frequency range (250MHz to 300 MHz)).
First, the control device 19 controls the antenna mast 13 via the turntable/antenna mast controller 18 to raise and lower the antenna 14 so that the antenna 14 is positioned at the initial measurement height (S10).
Next, the control device 19 controls the EMI receiver 16 to set the measurement frequency range of the EMI receiver 16 (i.e., the temporary measurement frequency range) to 100MHz to 150MHz, which is the first frequency range (first frequency range) (S11).
Next, the control device 19 controls the EMI receiver 16 so as to start measurement of the EMI receiver 16 (here, measurement of a peak value and a quasi-peak value is included), and rotates the turntable 11 once via the turntable/antenna mast controller 18 (S12). The rotation of the turntable 11 may be continuous rotation or stepwise rotation. In the case where the turntable 11 rotates in stages, measurement is performed while the turntable 11 is stopped.
When the turntable 11 rotates once and the control device 19 controls the EMI receiver 16 to end the measurement of the EMI receiver 16, the result obtained by the measurement of the EMI receiver 16 is obtained and displayed on the display (S13). Accordingly, the measurement is completed for the first frequency range (100MHz to 150MHz) (see the first frequency range of fig. 7).
Next, the control device 19 determines whether or not the measurement for the measurement frequency range of 100MHz to 300MHz is completed (S14). As a result, at this stage, the control device 19 determines that the measurement is not completed (no in S14), controls the EMI receiver 16 so that the measurement frequency range of the EMI receiver 16 (i.e., the temporary measurement frequency range) is set to 150MHz to 200MHz, which is the next frequency range (second frequency range) (S15), and once again rotates the turntable 11 once while starting the measurement (S12), thereby completing the measurement (S13). That is, moving to the next frequency range, the measurement is completed and the results obtained from the measurement by EMI receiver 16 are obtained and displayed on the display. Accordingly, the measurement is completed for the second frequency range (150MHz to 200MHz) (see the second frequency range in fig. 7).
Similarly, the measurement is completed for the third frequency range (200MHz to 250MHz) and the fourth frequency range (250MHz to 300MHz) (see the third frequency range and the fourth frequency range in fig. 7).
When the measurement completion control device 19 for the fourth frequency range (250MHz to 300MHz) completes the measurement for the measurement frequency range of 100MHz to 300MHz (yes in S14), it is determined whether the measurement for all the measurement heights is completed (S16).
As a result, at this stage, the controller 19 determines that all the measurement heights have not been measured (no in S16), and controls the antenna mast 13 via the turntable/antenna mast controller 18 to move (i.e., raise and lower) the antenna 14 so that the antenna 14 is located at the next measurement height (S17). Then, the same measurement as the measurement of the first measurement height is repeatedly performed (S11 to S16). Accordingly, at the next measurement height, measurement is performed for a measurement frequency range of 100MHz to 300 MHz.
When the measurement of all the measurement heights is completed in this manner (yes in S16), the control device 19 ends the provisional measurement step S21 of fig. 5 (S18).
The measurement shown in fig. 5 and 6 is performed using the impulse response characteristics required by CISPR 16-1-1 standard based on the measurement of the bandwidth of the broadband fast fourier transform.
As described above, the radiated interference wave measuring method according to the present embodiment measures a radiated interference wave from the object 12 to be measured in the measurement frequency range, and includes: a temporary measurement step S21 of performing a broadband measurement including peak detection and quasi-peak detection with respect to the radiated interference wave by the primary fast fourier transform of the EMI receiver 16, with respect to a measurement frequency range; a calculation step S22 of calculating a difference between the peak level and the quasi-peak level obtained by the provisional measurement step S21 for the measurement frequency that becomes a candidate of the measurement result of the measurement frequency range; a determination step S23 of determining whether or not the difference obtained in the calculation step S22 is smaller than a predetermined reference value corresponding to the measurement frequency; and an output step of outputting a result obtained by the wide band measurement as an interference level of the radiated interference wave (S24) when the difference is determined to be smaller than the reference value in the determination step S22, performing narrow band measurement as a measurement performed in a frequency range narrower than the measurement frequency range and based on a fast fourier transform of the EMI receiver 16 for the measurement frequency, and outputting a result obtained by the narrow band measurement as an interference level of the radiated interference wave (S25) when the difference is determined to be equal to or larger than the reference value in the determination step.
Accordingly, first, the broadband measurement by the EMI receiver 16 of the fast fourier transform method is temporarily performed, and whether or not the impulse response characteristic required by the standard is satisfied is determined from the obtained data, and if so, the result of the temporarily performed broadband measurement can be used as the result of the measurement of the interference level of the radiation interference wave finally. Therefore, in many cases where pulse noise with a low repetition frequency does not occur, the result of the broadband measurement performed temporarily can be used as the result of the measurement of the interference level of the final radiated interference wave, and high-quality and high-speed measurement without missing pulse noise can be performed by the EMI receiver 16 using the fast fourier transform method.
Further, the provisional measurement step, the calculation step, the judgment step, and the output step are all processes that can be executed by the fast fourier transform EMI receiver 16 and the control device 19 connected to the EMI receiver 16 via a communication path, and a series of these steps are automated by a computer or the like, so that it is possible to utilize measurement of the wide-band fast fourier transform frequency bandwidth and to perform the determination of the coincidence of the impulse response characteristic that satisfies the standard requirements without requiring complicated and difficult operations such as manual operation of the EMI receiver 16 or switching to a different type.
Further, in the output step, when it is determined in the determination step S23 that the difference is smaller than the reference value, a result of performing the broadband measurement under a condition different from that of the temporary measurement step S21 may be output as the interference level of the final radiated interference wave.
Accordingly, in the provisional measurement step S21, simple broadband measurement is performed only for determining whether or not the impulse response characteristic of the standard requirement is satisfied, and after the determination is satisfied, precise broadband measurement for determining the compliance of the standard requirement can be performed, and the compliance of the standard can be determined in a shorter time and with higher accuracy as a whole.
In the output step, when it is determined in the determination step S23 that the difference is equal to or greater than the reference value, narrow-band measurement is performed using a pre-selector, which is a filter that passes only signals in a frequency range narrower than the measurement frequency range.
Accordingly, the pulse response characteristics of the EMI receiver 16 can be measured by the fast fourier transform method using the pre-selector provided at the input stage of the EMI receiver 16.
In the determination step S23, the following determination is made by using 7dB for the measurement frequency of 9kHz to 150kHz, 13dB for the measurement frequency of 150kHz to 30MHz, and 21dB for the measurement frequency of 30MHz to 1000MHz as reference values.
Accordingly, it is possible to determine whether or not the response characteristics of the pulse having the repetition frequency of 20Hz or more can be measured according to the CISPR 16-2-3 standard, and therefore, the measurement satisfying the impulse response characteristics according to the CISPR standard can be performed.
A radiated interference wave measurement system according to the present embodiment measures a radiated interference wave from an object to be measured in a measurement frequency range, the radiated interference wave measurement system including: an EMI receiver for performing a broadband measurement including peak detection and quasi-peak detection by performing a first fast Fourier transform on a radiated interference wave with respect to a measurement frequency range; and a control device connected to the EMI receiver via a communication path, wherein the control device 19 obtains data obtained by a broadband measurement from the EMI receiver 16, calculates a difference between a peak level and a quasi-peak level obtained by the broadband measurement for a measurement frequency that is a candidate of a measurement result of a measurement frequency range based on the obtained data, determines whether the calculated difference is smaller than a predetermined reference value corresponding to the measurement frequency, outputs a result obtained by the broadband measurement as an interference level of a radiated interference wave when the difference is determined to be smaller than the reference value, controls the EMI receiver 16 to perform a narrowband measurement when the difference is determined to be greater than or equal to the reference value, outputs a result obtained by the narrowband measurement from the EMI receiver 16 as an interference level of a radiated interference wave, the narrowband measurement is performed in a frequency range narrower than the measurement frequency range, and is a fast fourier transform based measurement targeted at the measurement frequency.
Accordingly, the EMI receiver 16 and the control device 19 can utilize the measurement of the bandwidth of the fast fourier transform band by the wide band, and can automatically determine the matching of the impulse response characteristics that satisfy the standard requirements.
The present invention can also be realized as a program for causing a computer to execute the radiated interference wave measuring method according to the present embodiment, or a computer-readable recording medium such as a CD-ROM that records the program.
Accordingly, the control program of the EMI receiver 16 can utilize the measurement of the bandwidth of the fast fourier transform band by the wide band, and can automate the determination of the conformity of the impulse response characteristics that satisfy the standard requirements.
Although the radiated interference wave measuring method and the radiated interference wave measuring system according to the present invention have been described above based on the embodiments, the present invention is not limited to the two embodiments. The present invention is not limited to the embodiments described above, and various modifications and other embodiments may be made without departing from the spirit and scope of the present invention.
For example, in the above-described embodiment, the measurement frequency range is divided into four ranges, and the four divided frequency ranges are measured sequentially as objects, respectively. When the frequency bandwidth of the fast fourier transform is equal to or greater than the bandwidth of the entire measurement frequency range, the measurement of the entire measurement frequency range can be completed by one fast fourier transform.
In the above embodiment, the frequencies of a plurality of peaks selected in descending order from the highest peak in the spectrum of quasi-peaks obtained by the broadband measurement are used for the measurement frequencies that are candidates for the measurement result of the measurement frequency range, but the present invention is not limited to this. It is also possible to set only the frequency of the highest peak in the spectrum of quasi-peaks obtained by broadband measurement as the measurement frequency.
In the above embodiment, the control device 19 outputs the final measurement result to the display, but the output destination is not limited to the display, and may be output as data to an external device via a communication interface instead of or in addition to the display.
In the above embodiment, the process of fixing the height of the antenna 14, rotating the turntable 11, and measuring the radiated interference wave is repeated for each of the plurality of heights of the antenna 14, but the procedure is not limited to this. The method may be a method of repeating the process of measuring the radiated interference wave by fixing the angle of the turntable 11 and changing the height of the antenna 14 for each of a plurality of angles of the turntable 11, a method of measuring the radiated interference wave by changing both the angle of the turntable 11 and the height of the antenna 14, a method of measuring the radiated interference wave for a certain period of time by fixing both the angle of the turntable 11 and the height of the antenna 14, or the like.
In the above embodiment, the frequency range is switched after the turntable 11 is rotated once, but the switching of the measurement frequency range may be performed after the measurement is completed in a state where the heights of the antennas 14 are set to all the heights.
In the radiated interference wave measuring method according to the above embodiment, the turntable 11 is rotated once, but the method is not limited to this. The rotation of the turntable 11 may be an angle smaller than 360 degrees, or may be two or more rotations.
In the above-described embodiment, the measurement examples of 50MHz as a fast fourier transform frequency bandwidth and 100MHz to 300MHz as a measurement frequency range have been described, but these numerical values are only one example and are not limited to this. The fast fourier transform bandwidth may be a value different from 50MHz (for example, 100MHz, 500MHz, or the like), and the measurement frequency range may be a range in which a frequency of 1GHz or more is maximized.
The radiated interference wave measuring method and the radiated interference wave measuring system according to the present invention can be used not only as a radiated interference wave measuring system for determining whether or not a criterion of an allowable value satisfying a predetermined level such as CISPR22 criterion is satisfied, but also as an EMI device for measuring a peak value, a quasi-peak value, an average value, and an effective value of a radiated interference wave in an arbitrary measurement frequency range and in an arbitrary radiation direction.
Industrial applicability of the invention
The present invention can be used as a radiated interference wave measuring system, and particularly, can be used as a radiated interference wave measuring system for determining compliance of an impulse response characteristic required to satisfy CIPR 16-1-1 standard.
Description of the symbols
10 radiation interference wave measuring system
11 rotating platform
12 measured object
13 antenna mast
14 aerial
15 signal cable
16 EMI receiver
17 control cable
18 turntable/antenna mast controller
19 control device
20 EMI receiver
21 attenuator
22 pre selector
23 Mixer
24 intermediate frequency filter
25 wave detector
26 Detector
27 display
Claims (6)
1. A radiated interference wave measurement method for measuring a radiated interference wave from an object to be measured with respect to a measurement frequency range, the method comprising:
a temporary measurement step of performing a broadband measurement including peak detection and quasi-peak detection with respect to the radiated interference wave by a first fast fourier transform of an EMI receiver with respect to the measurement frequency range;
a calculation step of calculating a difference between the peak level and the quasi-peak level obtained in the provisional measurement step for a measurement frequency that becomes a candidate of the measurement result of the measurement frequency range;
a determination step of determining whether or not the difference obtained in the calculation step is smaller than a predetermined reference value corresponding to the measurement frequency; and
an output step of outputting a result obtained by the wide band measurement as an interference level of the radiated interference wave when it is determined by the determination step that the difference is smaller than the reference value, performing narrow band measurement which is measurement performed in a frequency range narrower than the measurement frequency range and is measurement by fast fourier transform of the EMI receiver for the measurement frequency, and outputting a result obtained by the narrow band measurement as an interference level of the radiated interference wave when it is determined by the determination step that the difference is equal to or larger than the reference value.
2. The radiated interference wave measuring method according to claim 1,
in the outputting, in a case where it is determined by the determining that the difference is smaller than the reference value, a result obtained by performing broadband measurement under a condition different from that of the broadband measurement in the temporary measuring is output as the interference level of the radiated interference wave.
3. The radiated interference wave measuring method according to claim 1,
in the outputting, when the determining determines that the difference is equal to or greater than the reference value, the narrow band measurement is performed by a pre-selector, which is a filter that passes only signals in a frequency range narrower than the measurement frequency range.
4. The radiated interference wave measuring method according to claim 1,
in the determination step, as the reference value, the determination is made using 7dB in the case where the measurement frequency is 9kHz to 150kHz, 13dB in the case where the measurement frequency is 150kHz to 30MHz, and 21dB in the case where the measurement frequency is 30MHz to 1000 MHz.
5. A radiated interference wave measurement system for measuring a radiated interference wave from an object to be measured in a measurement frequency range, the radiated interference wave measurement system comprising:
an EMI receiver for performing a broadband measurement including peak detection and quasi-peak detection with respect to the radiated interference wave by a single fast Fourier transform with respect to the measurement frequency range; and
a control device communicatively coupled to the EMI receiver,
the control device is used for controlling the operation of the motor,
obtaining, from the EMI receiver, data obtained from the wideband measurements,
calculating a difference between a peak level and a quasi-peak level obtained by the broadband measurement for a measurement frequency that becomes a candidate of a measurement result of the measurement frequency range, based on the obtained data,
determining whether the difference obtained by the calculation is smaller than a predetermined reference value corresponding to the measurement frequency,
and outputting a result obtained by the wideband measurement as an interference level of the radiated interference wave when it is determined that the difference is smaller than the reference value, controlling the EMI receiver to perform a narrowband measurement when it is determined that the difference is equal to or larger than the reference value, and outputting a result obtained by the narrowband measurement, which is a measurement performed in a frequency range narrower than the measurement frequency range and is a measurement by fast fourier transform targeted for the measurement frequency, from the EMI receiver as an interference level of the radiated interference wave.
6. A recording medium that is readable by a computer,
a program for causing a computer to execute the radiated interference wave measuring method according to any one of claims 1 to 4 is recorded.
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| PCT/JP2018/016285 WO2019202732A1 (en) | 2018-04-20 | 2018-04-20 | Radiation interference wave measurement method and radiation interference wave measurement system |
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| JP6669939B1 (en) | 2019-07-02 | 2020-03-18 | 株式会社東陽テクニカ | Related interference presenting apparatus and method |
| EP3845914A1 (en) * | 2020-01-03 | 2021-07-07 | Emzer Technological Solutions, S.L. | A measuring apparatus and a measuring method of electromagnetic interference |
| CN113702720B (en) * | 2021-08-31 | 2023-10-31 | 深圳信息通信研究院 | Multi-detection mode radiation spurious test method and detection system |
| JP2023051082A (en) | 2021-09-30 | 2023-04-11 | アンリツ株式会社 | Measurement system and measurement method |
| TWI806647B (en) * | 2022-06-08 | 2023-06-21 | 英業達股份有限公司 | Automatic test system and method for radio frequency and electromagnetic interference |
| CN116500368B (en) * | 2023-06-27 | 2023-09-15 | 中汽研新能源汽车检验中心(天津)有限公司 | System for evaluating consistency of radiation emission tests among laboratories and testing method thereof |
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| US11175327B2 (en) | 2021-11-16 |
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| CN110637234A (en) | 2019-12-31 |
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| JP6505348B1 (en) | 2019-04-24 |
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